The Encyclopedia Americana, Volume 7Grolier, 1985 - Encyclopedias and dictionaries |
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Page 145
The importance of coal tar pitches has in- creased tremendously in recent years because of the growing number of useful chemicals recov- ered and derived from them . However , the single most important use of coal tar pitch itself in ...
The importance of coal tar pitches has in- creased tremendously in recent years because of the growing number of useful chemicals recov- ered and derived from them . However , the single most important use of coal tar pitch itself in ...
Page 581
Pine cones are often produced in clusters and require 2 years to ripen . Among the conifers , only pine cones are spiny when mature . Pine trees are among the most important tim- ber sources .
Pine cones are often produced in clusters and require 2 years to ripen . Among the conifers , only pine cones are spiny when mature . Pine trees are among the most important tim- ber sources .
Page 760
One of the single most important properties of bulk copper is its very high electrical conductivity . This property ac- counts for the extensive use of copper in the electrical industry . The high electrical con- ductivity of copper is ...
One of the single most important properties of bulk copper is its very high electrical conductivity . This property ac- counts for the extensive use of copper in the electrical industry . The high electrical con- ductivity of copper is ...
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